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논문 기본 정보

자료유형
학술저널
저자정보
Peng Wan (University of Science and Technology Beijing) Hang Zou (University of Science and Technology Beijing) Kelu Wang (Nanchang Hangkong University) Zhengzhi Zhao (University of Science and Technology Beijing)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10
발행연도
2021.10
수록면
4,235 - 4,249 (15page)
DOI
10.1007/s12540-021-01016-4

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The thermal compression tests of Ti-22Al-26Nb-2Ta alloy under T = 1173 ~ 1423 K and ? = 0.001 ~ 10 s?1 were carried out onthe Gleeble-3500 thermo-mechanical simulator. The flow stress curves were obtained, and the high-temperature rheologicalproperties of the alloy were analyzed. The 3D activation energy maps were calculated and constructed. The least squaressupport vector machine (LSSVM) model of constitutive relation was established, and the penalty coefficient and kernelparameter of the LSSVM model were optimized by genetic algorithm (GA). The constitutive model of the alloy based on theGA-LSSVM algorithm was constructed. The predicted value of the model was also compared with the experimental data. The dynamic material model (DMM) and polar reciprocity model (PRM) were used to establish the 3D processing map ofthe alloy and appropriate thermal processing parameters. Our researches indicated that deformation temperature and strainrate have a great influence on the flow stress of Ti-22Al-26Nb-2Ta alloy. Ti-22Al-26Nb-2Ta alloy is a negative temperaturesensitiveand a positive strain rate-sensitive material. The correlation coefficient of GA-LSSVM algorithm constitutive modelis 0.9922, and the relative error of most samples is within 10%, accounting for 93.18%. The model has high prediction accuracyand strong generalization ability. The DMM processing map based on the Prasad instability criterion is more accurate inoptimizing the processing parameters of the alloy than that of the PRM processing map through analyzing the 3D processingmap and observing the microstructure. The instability modes in the instability region of the alloy mainly include adiabaticshear, crack, and local flow. The 1173 ~ 1273 K/0.001 ~ 0.003 s?1 are the best parameters during the processing of the alloy.

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